An-Najah Staff

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This study evaluates the physical properties of lead-free Sr3BF3 (B = As, Sb) photovoltaic compounds including

structural, electronic, mechanical, optical, thermodynamic, and thermoelectric behavior using calculations based

on DFT approach. Born stability criteria and formation enthalpy estimates show that the compounds under study

are mechanically and thermodynamically stable. The initial lattice constants for Sr3AsF3 and Sr3SbF3 were

determined to be 5.71 Å and 5.97 Å, respectively. While simulating the compounds under pressure, lattice

constants, cell volumes, and bond lengths decrease. The band structure investigation shows that these com

pounds are semiconducting with an adjustable direct bandgap. The electronic band gap contracts by pressure,

shifting the material from ultraviolet to the visible spectrum. This modification enhances electron transition from

valence band maxima to conduction band minima, enhancing optical efficiency. The shift and rise in ductility

and machinability index under pressure ensures good lubrication, low friction, and significant plastic defor

mation suitable for many industrial applications. Simultaneously, the static dielectric constant increases,

increasing absorption and conductivity and red-shifting the optical spectrum, and reducing reflectivity in the

visible spectrum. The thermodynamic behavior of the compounds was affected by both pressure and temperature

variation. The thermoelectric figure of merit becomes closer to unity with a shorter band gap, indicating

increased efficiency. Our findings suggest that Sr3BF3 (B = As, Sb) photovoltaic compounds could be used for the

invention of next-generation solar cells and thermoelectric devices.

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